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Mitsubishi Pajero Pinin. Manual - part 123

MPI <4G9> –

Troubleshooting

13C-78

Item
No.

Reference
page

Inspection
procedure
No.

Normal condition

Inspection contents

Inspection
item

Oxygen
sensor

Engine: After warm-up

Idling

0.2 V or less

Code No.
P0130

13C-25

sensor
(sensor 1)

Sudden racing

0.6 – 1.0 V

P0130

2,500 r/min

0.4 V or less and
0.6 – 1.0 V alter-
nates

Oxygen
sensor
(sensor 2)

Transmission:
2nd gear <M/T>,
L range <A/T>

Drive with throttle
widely open

3,500 r/min

0.6 – 1.0 V

Code No.
P0136

13C-27

Throttle
position
sensor

Engine coolant
temperature:
80

Release the acceler-
ator pedal.

6 – 20 %

Code No.
P0120

13C-22

sensor
(Throttle
valve open-
ing angle)

80 – 95

Ignition switch:
ON
(Engine: Stopped)

Depress the acceler-
ator pedal gradually

Increase in re-
sponse to pedal
depression
stroke.

Depress the acceler-
ator pedal fully.

80 – 100 %

MPI <4G9> –

Troubleshooting

13C-79

ACTUATOR TEST REFERENCE TABLE

Item
No.

Inspection
item

Drive contents

Inspection contents

Normal condition

Inspection
procedure
No.

Reference
page

Injectors

Cut fuel to No.
1 injector

Engine: After having warmed
up/Engine is idling
(Cut the fuel supply to each

Idling condition
becomes different
(becomes unsta

Code No.
P0201

13C-30

Cut fuel to No.
2 injector

(Cut the fuel supply to each
injector in turn and check
cylinders which don’t affect
idli

)

(becomes unsta-
ble).

Code No.
P0202

13C-30

Cut fuel to No.
3 injector

idling.)

Code No.
P0203

13C-30

Cut fuel to No.
4 injector

Code No.
P0204

13C-30

Fuel pump

Fuel pump
operates and
fuel is recircu-
lated.

Engine:
Cranking

Fuel
pump:
Forced
driving
Inspect
according

Pinch the
return hose
with fingers
to feel the
pulse of the
fuel being
recirculated.

Pulse is felt.

Procedure
No. 27

13C-69

according
to both
the above
conditions.

Listen near
the fuel tank
for the
sound of
fuel pump
operation.

Sound of opera-
tion is heard.

Purge
control
solenoid
valve

Solenoid valve
turns from
OFF to ON.

Ignition switch: ON

Sound of opera-
tion can be heard
when solenoid
valve is driven.

Code No.
P0443

13C-38

EGR con-
trol sole-
noid valve

Solenoid valve
turns from
OFF to ON.

Ignition switch: ON

Sound of opera-
tion can be heard
when solenoid
valve is driven.

Code No.
P0403

13C-36

Basic igni-
tion timing

Set to ignition
timing adjust-
ment mode

Engine: Idling
Timing light is set

BTDC

–

Fan relay

Drive the fan
motor

Ignition switch: ON

Radiator fan and
condenser fan
operate at high
speed

Proce-
dure No.
24

13C-67

MPI <4G9> –

Troubleshooting

13C-80

CHECK AT THE ENGINE-ECU TERMINALS

TERMINAL VOLTAGE CHECK CHART

Connect a needle-nosed wire probe (test harness:
MB991223 or paper clip) to a voltmeter probe.

Insert the needle-nosed wire probe into each of the
engine-ECU connector terminals from the wire side, and
measure the voltage while referring to the check chart.

NOTE
(1) Make the voltage measurement with the engine-ECU

connectors connected.

(2) You may find it convenient to pull out the engine-ECU

to make it easier to reach the connector terminals.

(3) The checks can be carried out off the order given

in the chart.

Caution
Short-circuiting the positive (+) probe between a
connector terminal and earth could damage the vehicle
wiring, the sensor, engine-ECU or all of them. Be
careful to prevent this!

If voltmeter shows any division from standard value, check
the corresponding sensor, actuator and related electrical
wiring, then repair or replace.

After repair or replacement, recheck with the voltmeter
to confirm that the repair has corrected the problem.

Needle-nosed wire probe

MPI <4G9> –

Troubleshooting

13C-81

Engine-ECU Connector Terminal Arrangement

Terminal
No.

Check item

Check condition (Engine condition)

Normal condition

No. 1 injector

While engine is idling after having
warmed up suddenly depress the

From 11 – 14 V, momentarily
drops slightly

No. 2 injector

warmed up, suddenly depress the
accelerator pedal.

drops slightly

No. 3 injector

No. 4 injector

Stepper motor coil <A>

Engine: Soon after the warmed up
engine is started

System voltage

0 V

(Changes repeatedly)

Stepper motor coil <B>

engine is started

(Changes repeatedly)

Stepper motor coil <C>

Stepper motor coil <D>

EGR control solenoid valve

Ignition switch: ON

System Voltage

While engine is idling, suddenly depress
the accelerator pedal.

From system voltage,
momentarily drops

A/C relay

Engine: Idle speed

A/C switch: OFF

→

(A/C compressor is operating)

System voltage or
momentarily
6 V or more

→

0 – 3 V

Purge control solenoid
valve

Ignition switch: ON

System voltage

valve

Running at 3,000 r/min while engine is
warming up after having been started.

0 – 3 V

Ignition coil – No. 1,
No. 4 (power transistor)

Engine r/min: 3,000 r/min

0.3 – 3.0 V

Ignition coil – No. 2,
No. 3 (power transistor)

Power supply

Ignition switch: ON

System voltage

Air flow sensor reset
signal

Engine: Idle speed

0 – 1 V

signal

Engine r/min: 3,000 r/min

6 – 9 V

Condenser motor relay
(HI)

Radiator fan is not operating (Engine
coolant temperature is 90

C or less)

System voltage

Radiator fan is not operating (Engine
coolant temperature is 105

C or less)

0 – 3 V

Content .. 121 122 123 124 ..